While most of us can tell if we’re too drunk to drive, a new app is making that easier.

Say hello to the cleverly titled BreathalEyes, a new app for the iPhone that scans a person’s eyes to see if they are too drunk to drive. The official Web site for the app says that BreathalEyes can “approximate an intoxicated individual’s blood alcohol content, anytime and anywhere.”

The app uses new technology that can scan the eyes to “detect and analyze Horizontal Gaze Nystagmus” which is a sign of drunkenness. The technology is based on 40 years of public and private testing. It has an effective range of 0.02 percent to 0.17 percent BAC.

The app is listed as being “for entertainment purposes only.” They remind users that everybody reacts differently to alcohol and that the test results are for reference only. The results may be affected by high altitude or medications.

In tests run by the app developer, they found that their app and a breathalyzer come to almost the same result.

Any potential drunk needs a designated tester to use the app on them as it requires a steady hand and decent lighting.

The app is available now for iPhone 4 and later for $0.99. An Android version is expected later this year.

Now the real challenge is convincing the drunk to hand over their keys. Maybe somebody will make an app for that one day.